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    Magnetic properties of trinuclear Ni-M-Ni complexes, M = Mn, Co and Ni
    (Elsevier, 2006) Atakol, Orhan; Boca, Roman; Ercan, İsmail; Ercan, Filiz; Fuess, Hartmut; Haase, Wolfgang; Herchel, Radovan
    A tetradentate ligand, abbr. L2- =dmSALPD(2-) = N,N'-bis(sahcylidene)-1,3-propanediaminato dianion, has been complexed with metal ions in the presence of dimethylformamide (dmf) and nitrite anion. As a result, trinuclear molecular complexes of the type [M-II- {Ni(NO2(L2-)(dmf)}(2)], where M-II = Mn(II), Co(II) and Ni(II) were obtained. The magnetic susceptibility and magnetization data were treated simultaneously during the fitting procedure. In addition to the isotropic exchange, the zero-field splitting parameters D-A were added to the spin Hamiltonian. An anti-ferromagnetic interaction was found in all complexes and the single ion magnetic anisotropy parameter for the Ni(II) peripheral centers adopt considerable values.
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    Structural analysis of bis{(N,N -dimethylformamide) (mu-formato)[mu-bis(salicylidene)-1,3-propanediaminato] nickel(II)}copper(II) and zinc(II) monohydrate hetero-trinuclear complexes
    (Wiley-V C H Verlag Gmbh, 2004) Ercan, Filiz; Ateş, Meltem B.; Ercan, İsmail; Durmuş, Sefa; Atakol, Orhan
    The two linear hetero-trinuclear metallic complexes with Cu2+, Ni2+ and Zn2+ ions, [CuNi2 {(CHO2)(SALPD)[(CH3)(2)NCHO]}(2)],(I) and [ZnNi2{(CHO2)(SALPD)[(CH3)(2)NCHO]}(2)],(II), form crystals which belong to the monoclinic system, space group P2(1)/c, with unit cell dimensions a = 10.537(4), b = 16.612(5), c = 13.837(3) Angstrom, beta = 111.09(5)degrees, V = 2259.8(12) Angstrom(3) in (II) and a = 10.525(4), b = 16.658(5), c = 13.826(3)Angstrom, beta = 111.11(5)degrees,V = 2261.4(8) Angstrom(3) in (II), respectively. The coordinations around the M (Ni2+, Cu2+, Zn2+) ions in the title complexes are distorted octahedrals. The stereochemistries of the bridge ligands, linking to the metal ions each other, are changed between Ni...M (Cu2+, Zn2+) distances. The Ni...M (Cu2+, Zn2+) distances are 3.0469(13) and 3.0645(14), respectively. (C) 2004 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
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    Synthesis and crystal structure of a homotrinuclear Ni(II) complex
    (Walter De Gruyter Gmbh, 2005) Durmuş, Sefa; Ateş, B. Meltem; Atakol, Orhan; Ercan, Filiz
    A tetradentate ONNO type Schiff base was synthesized from salicyaldehyde and 1,4-diaminobutane. Thermogravimetfic analysis, elemental analysis and X-ray diffraction results showed this Schiff base to give a trinuclear complex with Ni(II) ions in presence of acetate ions. The complex crystallizes in the triclinic P (1) over bar space group with a = 9.7510(2), b = 10.6854(2), c = 12.4781(4) angstrom, alpha = 112.101(3), beta = 100.621(4) and gamma = 91.733(3)degrees. Similar to those found in the literature the terminal Ni(II) ions are coordinated to the Schiff base and have a N2O4 coordination sphere. The central Ni(II) ion has a O-6 coordination sphere formed by the phenolic oxygens and the acetate bridges. The conformation of the chelate ring formed between the Ni(H) ions and the iminic nitrogens were examined.
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    Synthesis, crystal structure and magnetic behaviour of a mononuclear Fe(III) - schiff base metal complex
    (Oldenbourg Verlag, 2006) Nazır, Hasan; Akben, Nimet Sapmaz; Ateş, Meltem Bürke; Sözeri, Hüseyin; Ercan, İsmail; Atakol, Orhan; Ercan, Filiz
    A complex from Fe(II) and a hexa-dentate linear ligand containing O2N4 donor atoms were prepared and the structure enlightened with X-ray diffraction. The Fe(II) ion in the complex was seen to be oxidized to form a Fe(III) complex, [C20H24Cl3N4O2]Fe and the three chloride ions were situated at a distance of Fe...Cl(1) 3.976(5), Fe... Cl(2) 4.479(3) and Fe... Cl(3) 7.509(4) (A) over circle outside the coordination sphere. The Fe(III) ion has an octahedral coordination sphere and as expected the two oxygen donor atoms are coordinated in a -cis position. The Fe-O, Fe-N-imin and Fe-N-amine distances are 1.880(3) (A) over circle, 1.931(4) (A) over circle and 2.004(4) (A) over circle, respectively.